Finding hidden treasure can be tricky. Especially if that treasure has been masking as something else for almost 100 years.

Auction valuer Guy Schwinge was doing a routine art valuation at a house in Dorset, England, when he glanced outside a window and noticed something mysterious lurking in the bushes. What he saw in the garden was being used as a decorative flower container, BBC News reports. But Schwinge’s keen eye immediately saw dollar signs.

Scroll down for a photo of the coffin.

"As I drew closer I realized I was looking at a Roman sarcophagus of exceptional quality," Schwinge told BBC.

After scanning through an auction catalogue from 1913, Scwinge discovered that the flower container was actually a valuable Roman marble coffin acquired by the English family almost a century ago. The historical relic recently sold for £96,000, or roughly $154,000, at an auction.

The coffin was once owned by Sir John Robinson, one of the most well known art experts of the 19th century, according to the Daily Mail. In 1913, the coffin was sold at an auction to a family in England.

Dating back to the second century AD, the coffin was originally made for a very high ranking Italian official.

England has seen it's fair share of stumbled upon valuables in the last couple of months. An eight-year-old boy was visiting Dorset beach in Hengistbury Head when he found a piece of whale vomit in a patch of seaweed worth £40,000, or around $64,000, BBC News reported.

Accidental discoveries, though rare, are nothing new. In July, gardeners on the Swiss-German border came across ten unmarked gold bars with an estimated value of $126,000. The gardeners are able to claim the gold as their own until someone can prove ownership within the next five years.

While the chances of you finding 10 gold bars of your own may be slim, there may be equally valuable items lying around your house. InfoBarrel has a list of old household items, like old ticket stubs, photographs and phone books, that may have real value to collectors.

Take a look at our slideshow of other weird things that have sold for big bucks:

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Wacky Finds Worth Big Bucks

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Bryan Fite, a Missouri resident, uncovered a hidden stash of century-old whiskey bottles underneath the floorboards in his attic. Rare bottles of whiskey have sold for as much as $200,000.

Gardeners stumbled across a number of unmarked gold bars, known as "ingots," under a bush while cutting grass in the Swiss of town of Klingnau near the German border. The 10 bars are worth an estimated $126,000.

A Sacramento couple found a 1961 wedding ring between the seats of a car they had just purchased a few months earlier.

A California mom found a meteorite worth more than gold at a local park where she frequently brings her dog and kids.

An unemployed man sold an original Picasso print that he found in a thrift store for $7,000.

An unemployed Illinois man found duffle bags full of cash totaling $150,000 in his backyard.

A man got down on his knees for a second time after he found his wife's engagement ring in a toilet 36 years after she had lost it.

After a family in Salt Lake City found $40,000 in cash in the attic of their recently-purchased home, they returned the money to its rightful owner.

A worker in Idaho returned a diamond ring to its rightful owner after finding the treasure in a sewer. The owner thought she had lost it forever when she accidentally flushed it down the toilet.

Federal Way Quality Control Officer Shea Munroe stumbled upon an etching by famed surrealist painter Salvador Dali at a Goodwill in Tacoma, Wash. The thrift store find would go on to sell for $21,005 in an online auction.

Cheryl Gavazzi was shopping at Marshalls in Beverly, Mass. when a purse caught her eye. But what was inside the purse -- $11,000 in cash -- is what really got her attention. She would hand over the bag to the police, who found the original owner who said the money was being used to build a church in Guatemala.

How's this for a page turner: A Wellesley, Mass. man found $20,000 in cash hidden in the pages of a book he discovered at a used book-swap. The man has asked to remain anonymous but said anyone with info on the books rightful owner could contact him at Ipatimga2005@comcast.net.

An 8-year-old boy named Charlie Naysmith made a strange -- and pricey -- discovery when walking along the Hengistbury Head beach in Great Britain. Thinking he'd stumbled upon a yellow rock, Naysmith had actually found ambergris, a substance barfed or pooped up by sperm whales. The piece is estimated to be worth upwards of $63,000.

Karl Kissner of Toledo, Ohio found a collection of baseball cards in his grandfather's attic that fetched a tremendous sum. The 37 baseball cards featuring the likes of Hall of Famers Ty Cobb, Cy Young and Honus Wagner fetched $566,132 during bidding.